Starting-valve for explosive-engines.



2 SHEETS-SHEET 1.

r 4 1 Hl n 7 llm%l iw/ wm L L A C. 0 M H STARTING VAL-VB FOR EXPLOSIVBENGINES.

APPLICATION FILED FEB. e. 1902.

H0 MODEL:

Q/vitmooeo .N0..718,574. PATENTED JAN. 13, 1903.

' H. M. MOGALL.

STARTING VALVE FOR EXPLOSIVE ENGINES. AYPLIOATION FILED 'FEBJ. 19oz.

UNITED STATES PATENT OFFICE.

HARRY MOGALL, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO PITTS- BURG GASENGINE COMPANY, OF PITTSBURG, PENNSYLVANIA.

STARTING-VALVE FOR EXPLOSlVE-ENGINES.

SPECIFICATION forming part of Letters Patent N 0. 718,574,dated'J'anuar-y 13, 1903.

Application filed February 6, 1902. Serial No. 92,806- (No model.)

To all ZUhOT/b it ntay concern:

Be it known that I, HARRY M. MOCALL,'a citizen of the United States,residing at Pittsburg, in the county of Allegheny, State ofPennsylvania, have invented certain new and useful Improvements inStarting-Valves for Explosive-Engines; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanyingdrawings', forming a part of thisspecification.

My invention has relation to starting-valves for explosive-engines; andit consists in the novel construction and arrangement of its parts, ashereinafter described.

The valve is especially adapted to be used on air and gas engines toafford a handy means for opening a port into the cylinder when theengine is started.

The object of my invention is to provide a means for opening and closinga valve without necessitating the operator to bring his hand in contactwith the stem of the valve. As a rule these valves are located on thecylinder end, and as they are not protected by water-jackets or anyother cooling means they necessarily become very hot and frequently theoperator burns himself in attempting to open the valve at the startingof the engine.

The invention is an opening device applied to a valve of ordinaryconstruction and consisting of a yoke made in the form of a lever whichis fulcrumed at one end to the .valvecasing and is provided with a blockadapted to engage the valve-stem and to depress the same, thus openingthe valve and overcoming the tension of the coil-spring, which normallyholds the valve in a closed position. A reinforcing-post is provided,which is located on the valve-casing andacts as a guide for thevalve-stem in a manner as willbe here.- inafter described.

In the accompanying drawings, Figure 1 is a side elevation of the valvewith the opening device located therein. Fig. 2 is a transversesectional view of the valve, showing the opening device depressing thevalve. Fig. 3 is a transverse sectional view of a valve, showing theposition of the opening device when the valve is closed. Fig. 4 is ahorizontal sectional view of the valve cut on line 4 4 of Fig. 1. Fig. 5isa horizontal sectional view of the valve cut on line 5 5 of Fig. 2.Fig. 6 is a transverse sectional view of the upper end of anengine-cylinder, showing a valve located thereon.

The valve-casing 1 is secured by any suitable means to the cylinder, asshown in Fig. 6. The said casing is provided with an ordinary valve 2,which is adapted to come against the ordinary seat 3. On top of thecasing 1 is located a dome 4, said dome having in its sides a number ofports 5. The valve-stem 6 passes perpendicularly through the center ofthe top of the dome 4 and is provided at its upper end with a pair ofjamnuts 7, which engage suitable threads cut on the upper end of thesaid stem 6. The coilspring 8 is interposed between the lower jamnut 7and the top of the dome 4. The tension of the said spring 8 has atendency to maintain the valve-stem 6 and the valve 2 in their upperpositions, as shown in Fig. 3. The post 9 is located on top of the dome4, the lower end of said post being driven in a suitable aperture in thetop of said dome, as shown in Fig. 2, the side of said post bearinglightly against the edges of the jam-nuts 7 and forms a guide for thesame and prevents the said nuts from unscrewing. The lever 10 isbifurcated at its lower end, the said bifurcations being fnlcrumed atthe points 11 to the sides of the dome 4 in a manner as shown in Fig. 1,the said bifurcations of the said lever 10 forming a yoke, to the underside of the middle of which is attached a block 12. The upper portion ofthe lever 10 terminates in the handle 13'. The block 12 consists of abody portion having a surface 13, which is adapted to bearperpendicularly against the stein 6 when the lever 10 is in a positionas shown in Fig. 2, thus holding the said stem 6 and its attachments ina depressed po- Fig. 3. Before the operator begins to revolve thefly-wheel in order to start the engine he moves the lever 10 in theposition as shown in Figs. 1 and 2. The inclined lower surface of thelug 14 passing up over the rounded upper surface of the upper jam-nut 7forces the said nut down, which in turn depresses the valve-stem 6 andthe valve 2, forcing the said valve away from the valve-seat 3, thusmaking it possible for air to enter through the ports 5 of the dome 4,past the valve-seat 3 into the interior of the casing 1, and from thenceinto the cylinder of the engine, thus preventing the creation of avacuum in the cylinder of the engine and permitting the piston-head toretreat freely. Thus the flywheel can be revolved with ease and theengine can be started. After the engine is started the operator pullsthe lever 10 into the position as shown in Fig. 3, when the valve 2 isclosed against the seat 3, thus preventing the entrance of air throughthe ports 5 into the engine-cylinder and compelling the piston-head inits forward movements to draw in the gases or other explosive mixtures.In the perpendicular movement of the valve-stem 6 the post 9 bearsslightly against the edges of the jamnuts 7 and acts as a guideindirectly for the valve-stem, causing it to move in an exactperpendicular direction and preventing the said stem from binding in theaperture in the top of the dome 4, through which it passes. At the sametime it causes the valve 2 to close in its proper relative positionagainst the seat 3, and, furthermore, it prevents the jam-nuts 7 fromunscrewing from the valvestem 6. In case it should be necessary toregrind the valve 2 or the seat 3 the post 9 is placed in a vise, and bystriking the top of the dome 4 with a hammer or other implement thevalve-casing and its attachments may be separated from the said post 9.When this is done, oil or a suitableabrasive may be admitted against thevalve-seat 3 and the valve 2 through the ports 5. Then by securing thestem 6 in the jaws of a vise the valvecasing 1 may be partially revolvedin opposite directions by hand, and the seat 2 and the valve 3 can inthis manner he reground. It will he observed that the length of the post9 is such that its upper end is just above the surface 13 of theshunting mechanism 12 when the lever 10 is in the position as shown inFig. 2. Thus the end of the said post 9, bearing against the lowerinclined surface of the lug 14, acts as a stop for the said lever andprevents it from swinging entirely over the valve-stem 6 and itsattachments.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. In combination with a reciprocating Valve, a lever suitably fulcrumed, a block attached to said lever and adapted to engage the valve-stemand depress the same, a stop attached to the valve-casing and adapted tolimit the movement of the lever in one direction, said stop also actingas a guide for the valve-stem.

2. In combination with a reciprocating valve having a projected stem, anut located at the end of said stem and a spring interposed between saidnut and the valve-casing, a lever suitably fulcrumed and havinga blockadapted to engage said nut and depress the same and the valve, a posterected on the valve-casing and adapted to act as a stop for the lever,as a guide for the Valve-stem and as a means for preventing therevolving of the nut with relation to the valve-stem.

In testimony whereof I affix my signature in presence of two witnesses.

HARRY M. MCCALL.

W'itnesses:

ANSON S. TAYLOR, J. THEo. RALPH.

